Urban theorist and former mayor of Bogota Enrique Penalosa, makes this important point about the political significance of dedicating lanes to his city's buses:

[TransMilenio system] is a powerful symbol of democracy... It shows that public transportation has a priority in the use of road space over private cars.

Not only that, but dedicating lanes to buses is actually not expensive. Begin at 1:33:

If our city took the democracy of public transportation at all seriously, this is what RapidRide would look like...

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